How many retrowavey, electroclashy hipsters really know the true roots of the sound they’re preening and prancing to? We’re not talking about ’80s swill like Human League or Erasure—we’re referring to Robert Moog, the inventor of the eponymous sound-generating device that, more than any other single contraption, made the whole electronic-music world possible. Analog Days, penned by Trevor Pinch and Frank Trocco, is a richly detailed look at the early days of synthesized sounds, and is quite fascinating.